package com.etcsoft.examples.ui.binding;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.BeanProperties;
import org.eclipse.core.databinding.beans.BeansObservables;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.value.ComputedValue;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.WritableValue;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.databinding.viewers.ViewerSupport;
import org.eclipse.jface.databinding.viewers.ViewersObservables;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;

public class Snippet019TreeViewerWithListFactory {

    private Button pasteButton;
    private Button copyButton;
    private Shell shell;
    private Button addChildBeanButton;
    private Button removeBeanButton;
    private TreeViewer beanViewer;
    private Tree tree;
    private Text beanText;
    private DataBindingContext m_bindingContext;

    private Bean input = createBean("input");
    private IObservableValue clipboard;

    /**
     * Launch the application
     *
     * @param args
     */
    public static void main(String[] args) {
        Display display = Display.getDefault();
        Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable() {
            @Override
            public void run() {
                try {
                    Snippet019TreeViewerWithListFactory window = new Snippet019TreeViewerWithListFactory();
                    window.open();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Open the window
     */
    public void open() {
        final Display display = Display.getDefault();
        createContents();
        shell.open();
        shell.layout();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
    }

    /**
     * Create contents of the window
     */
    protected void createContents() {
        shell = new Shell();
        final GridLayout gridLayout_1 = new GridLayout();
        gridLayout_1.numColumns = 2;
        shell.setLayout(gridLayout_1);
        shell.setSize(535, 397);
        shell.setText("SWT Application");

        final Composite group = new Composite(shell, SWT.NONE);
        final RowLayout rowLayout = new RowLayout();
        rowLayout.marginTop = 0;
        rowLayout.marginRight = 0;
        rowLayout.marginLeft = 0;
        rowLayout.marginBottom = 0;
        rowLayout.pack = false;
        group.setLayout(rowLayout);
        group
                .setLayoutData(new GridData(SWT.FILL, SWT.FILL, false, false,
                        2, 1));

        final Button addRootButton = new Button(group, SWT.NONE);
        addRootButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent e) {
                List list = input.getList();
                Bean root = createBean("root");
                list.add(root);
                input.setList(list);

                beanViewer.setSelection(new StructuredSelection(root));
                beanText.selectAll();
                beanText.setFocus();
            }
        });
        addRootButton.setText("Add Root");

        addChildBeanButton = new Button(group, SWT.NONE);
        addChildBeanButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent e) {
                Bean parent = getSelectedBean();
                List list = new ArrayList(parent.getList());
                Bean child = createBean("child");
                list.add(child);
                parent.setList(list);

                beanViewer.setSelection(new StructuredSelection(child));
                beanText.selectAll();
                beanText.setFocus();
            }
        });
        addChildBeanButton.setText("Add Child");

        removeBeanButton = new Button(group, SWT.NONE);
        removeBeanButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent e) {
                TreeItem selectedItem = beanViewer.getTree().getSelection()[0];
                TreeItem parentItem = selectedItem.getParentItem();
                Bean parent;
                int index;
                if (parentItem == null) {
                    parent = input;
                    index = beanViewer.getTree().indexOf(selectedItem);
                } else {
                    parent = (Bean) parentItem.getData();
                    index = parentItem.indexOf(selectedItem);
                }

                List list = new ArrayList(parent.getList());
                list.remove(index);
                parent.setList(list);
            }
        });
        removeBeanButton.setText("Remove");

        copyButton = new Button(group, SWT.NONE);
        copyButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent e) {
                clipboard.setValue(getSelectedBean());
            }
        });
        copyButton.setText("Copy");

        pasteButton = new Button(group, SWT.NONE);
        pasteButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent e) {
                Bean copy = (Bean) clipboard.getValue();
                if (copy == null)
                    return;
                Bean parent = getSelectedBean();
                if (parent == null)
                    parent = input;

                List list = new ArrayList(parent.getList());
                list.add(copy);
                parent.setList(list);

                beanViewer.setSelection(new StructuredSelection(copy));
                beanText.selectAll();
                beanText.setFocus();
            }
        });
        pasteButton.setText("Paste");

        final Button refreshButton = new Button(group, SWT.NONE);
        refreshButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent e) {
                beanViewer.refresh();
            }
        });
        refreshButton.setText("Refresh");

        beanViewer = new TreeViewer(shell, SWT.FULL_SELECTION | SWT.BORDER);
        beanViewer.setUseHashlookup(true);
        tree = beanViewer.getTree();
        tree.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1));

        final Label itemNameLabel = new Label(shell, SWT.NONE);
        itemNameLabel.setText("Item Name");

        beanText = new Text(shell, SWT.BORDER);
        final GridData gd_beanValue = new GridData(SWT.FILL, SWT.CENTER, true,
                false);
        beanText.setLayoutData(gd_beanValue);
        m_bindingContext = initDataBindings();
        //
        initExtraBindings(m_bindingContext);
    }

    private static Bean createBean(String name) {
        return new Bean(name);
    }

    protected DataBindingContext initDataBindings() {
        IObservableValue treeViewerSelectionObserveSelection = ViewersObservables
                .observeSingleSelection(beanViewer);
        IObservableValue textTextObserveWidget = SWTObservables.observeText(
                beanText, SWT.Modify);
        IObservableValue treeViewerValueObserveDetailValue = BeansObservables
                .observeDetailValue(treeViewerSelectionObserveSelection,
                        "text", String.class);
        //
        //
        DataBindingContext bindingContext = new DataBindingContext();
        //
        bindingContext.bindValue(textTextObserveWidget,
                treeViewerValueObserveDetailValue);
        //
        return bindingContext;
    }

    private Bean getSelectedBean() {
        IStructuredSelection selection = (IStructuredSelection) beanViewer
                .getSelection();
        if (selection.isEmpty())
            return null;
        return (Bean) selection.getFirstElement();
    }

    private void initExtraBindings(DataBindingContext dbc) {
        final IObservableValue beanViewerSelection = ViewersObservables
                .observeSingleSelection(beanViewer);
        IObservableValue beanSelected = new ComputedValue(Boolean.TYPE) {
            @Override
            protected Object calculate() {
                return Boolean.valueOf(beanViewerSelection.getValue() != null);
            }
        };
        dbc.bindValue(SWTObservables.observeEnabled(addChildBeanButton),
                beanSelected);
        dbc.bindValue(SWTObservables.observeEnabled(removeBeanButton),
                beanSelected);

        clipboard = new WritableValue();
        dbc.bindValue(SWTObservables.observeEnabled(copyButton), beanSelected);
        dbc.bindValue(SWTObservables.observeEnabled(pasteButton),
                new ComputedValue(Boolean.TYPE) {
                    @Override
                    protected Object calculate() {
                        return Boolean.valueOf(clipboard.getValue() != null);
                    }
                });

        ViewerSupport.bind(beanViewer, input, BeanProperties.list("list",
                Bean.class), BeanProperties.value(Bean.class, "text"));
    }

    static class Bean {
        /* package */PropertyChangeSupport changeSupport = new PropertyChangeSupport(
                this);
        private String text;
        private List list;

        public Bean(String text) {
            this.text = text;
            list = new ArrayList();
        }

        public void addPropertyChangeListener(PropertyChangeListener listener) {
            changeSupport.addPropertyChangeListener(listener);
        }

        public void removePropertyChangeListener(PropertyChangeListener listener) {
            changeSupport.removePropertyChangeListener(listener);
        }

        public String getText() {
            return text;
        }

        public void setText(String value) {
            changeSupport.firePropertyChange("text", text,
                    text = value);
        }

        public List getList() {
            if (list == null)
                return null;
            return new ArrayList(list);
        }

        public void setList(List list) {
            if (list != null)
                list = new ArrayList(list);
            changeSupport.firePropertyChange("list", this.list,
                    this.list = list);
        }

        public boolean hasListeners(String propertyName) {
            return changeSupport.hasListeners(propertyName);
        }
    }
}

